Not sure I like this idea of varying preflop raise size based on stack size. It doesn't really come into play for me most of the time at the micros, where it seems there's always someone ready to 3-bet shove no matter what you do. Ideally, I'd prefer a fixed and smaller (2.2-2.5x) pre-flop raise amount regardless of position and card strength. Much easier to disguise your hand this way, and gives you more options when you get re-raised. You can easily fold, call or 4-bet. However, at micro stakes I find this works less often and feel the I need to raise bigger and bigger to get casual players to fold. Some people just love to shove on you preflop anytime you make a smallish raise because they see it as weak. On the other hand, some people love to shove on you when you raise bigger because they think you're bluffing. It helps to know your opponents, which of course is not always possible online.
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